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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2012 The Netty Project</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * The Netty Project licenses this file to you under the Apache License,</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * version 2.0 (the "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * with the License. You may obtain a copy of the License at:</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * License for the specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> org.jboss.netty.util.internal;
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.Executor;
<a class="jxr_linenumber" name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.ExecutorService;
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.TimeUnit;
<a class="jxr_linenumber" name="21" href="#21">21</a>  
<a class="jxr_linenumber" name="22" href="#22">22</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="23" href="#23">23</a>  <em class="jxr_javadoccomment"> * Shuts down a list of {@link Executor}s.  {@link #terminate(Executor...)} will</em>
<a class="jxr_linenumber" name="24" href="#24">24</a>  <em class="jxr_javadoccomment"> * shut down all specified {@link ExecutorService}s immediately and wait for</em>
<a class="jxr_linenumber" name="25" href="#25">25</a>  <em class="jxr_javadoccomment"> * their termination.  An {@link Executor} which is not an {@link ExecutorService}</em>
<a class="jxr_linenumber" name="26" href="#26">26</a>  <em class="jxr_javadoccomment"> * will be ignored silently.</em>
<a class="jxr_linenumber" name="27" href="#27">27</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/jboss/netty/util/internal/ExecutorUtil.html">ExecutorUtil</a> {
<a class="jxr_linenumber" name="29" href="#29">29</a>  
<a class="jxr_linenumber" name="30" href="#30">30</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="31" href="#31">31</a>  <em class="jxr_javadoccomment">     * Try to call {@link ExecutorService#shutdownNow()}</em>
<a class="jxr_linenumber" name="32" href="#32">32</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="33" href="#33">33</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> shutdownNow(Executor executor) {
<a class="jxr_linenumber" name="34" href="#34">34</a>          <strong class="jxr_keyword">if</strong> (executor instanceof ExecutorService) {
<a class="jxr_linenumber" name="35" href="#35">35</a>              ExecutorService es = (ExecutorService) executor;
<a class="jxr_linenumber" name="36" href="#36">36</a>              <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="37" href="#37">37</a>                  es.shutdownNow();
<a class="jxr_linenumber" name="38" href="#38">38</a>              } <strong class="jxr_keyword">catch</strong> (SecurityException ex) {
<a class="jxr_linenumber" name="39" href="#39">39</a>                  <em class="jxr_comment">// Running in a restricted environment - fall back.</em>
<a class="jxr_linenumber" name="40" href="#40">40</a>                  <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="41" href="#41">41</a>                      es.shutdown();
<a class="jxr_linenumber" name="42" href="#42">42</a>                  } <strong class="jxr_keyword">catch</strong> (SecurityException ex2) {
<a class="jxr_linenumber" name="43" href="#43">43</a>                      <em class="jxr_comment">// Running in a more restricted environment.</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>                      <em class="jxr_comment">// Can't shut down this executor - skip to the next.</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>                  } <strong class="jxr_keyword">catch</strong> (NullPointerException ex2) {
<a class="jxr_linenumber" name="46" href="#46">46</a>                      <em class="jxr_comment">// Some JDK throws NPE here, but shouldn't.</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>                  }
<a class="jxr_linenumber" name="48" href="#48">48</a>              } <strong class="jxr_keyword">catch</strong> (NullPointerException ex) {
<a class="jxr_linenumber" name="49" href="#49">49</a>                  <em class="jxr_comment">// Some JDK throws NPE here, but shouldn't.</em>
<a class="jxr_linenumber" name="50" href="#50">50</a>              }
<a class="jxr_linenumber" name="51" href="#51">51</a>          }
<a class="jxr_linenumber" name="52" href="#52">52</a>      }
<a class="jxr_linenumber" name="53" href="#53">53</a>  
<a class="jxr_linenumber" name="54" href="#54">54</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment">     * Returns {@code true} if and only if the specified {@code executor}</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>  <em class="jxr_javadoccomment">     * is an {@link ExecutorService} and is shut down.  Please note that this</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>  <em class="jxr_javadoccomment">     * method returns {@code false} if the specified {@code executor} is not an</em>
<a class="jxr_linenumber" name="58" href="#58">58</a>  <em class="jxr_javadoccomment">     * {@link ExecutorService}.</em>
<a class="jxr_linenumber" name="59" href="#59">59</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="60" href="#60">60</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> isShutdown(Executor executor) {
<a class="jxr_linenumber" name="61" href="#61">61</a>          <strong class="jxr_keyword">if</strong> (executor instanceof ExecutorService) {
<a class="jxr_linenumber" name="62" href="#62">62</a>              <strong class="jxr_keyword">if</strong> (((ExecutorService) executor).isShutdown()) {
<a class="jxr_linenumber" name="63" href="#63">63</a>                  <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="64" href="#64">64</a>              }
<a class="jxr_linenumber" name="65" href="#65">65</a>          }
<a class="jxr_linenumber" name="66" href="#66">66</a>          <strong class="jxr_keyword">return</strong> false;
<a class="jxr_linenumber" name="67" href="#67">67</a>      }
<a class="jxr_linenumber" name="68" href="#68">68</a>  
<a class="jxr_linenumber" name="69" href="#69">69</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="70" href="#70">70</a>  <em class="jxr_javadoccomment">     * Shuts down the specified executors.</em>
<a class="jxr_linenumber" name="71" href="#71">71</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="72" href="#72">72</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> terminate(Executor... executors) {
<a class="jxr_linenumber" name="73" href="#73">73</a>          terminate(DeadLockProofWorker.PARENT, executors);
<a class="jxr_linenumber" name="74" href="#74">74</a>      }
<a class="jxr_linenumber" name="75" href="#75">75</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="76" href="#76">76</a>  <em class="jxr_javadoccomment">     * Shuts down the specified executors using the given {@link ThreadLocal} to check if there is a deadlock</em>
<a class="jxr_linenumber" name="77" href="#77">77</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="78" href="#78">78</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> terminate(ThreadLocal&lt;Executor&gt; deadLockChecker, Executor... executors) {
<a class="jxr_linenumber" name="79" href="#79">79</a>          <em class="jxr_comment">// Check nulls.</em>
<a class="jxr_linenumber" name="80" href="#80">80</a>          <strong class="jxr_keyword">if</strong> (executors == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="81" href="#81">81</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"executors"</span>);
<a class="jxr_linenumber" name="82" href="#82">82</a>          }
<a class="jxr_linenumber" name="83" href="#83">83</a>  
<a class="jxr_linenumber" name="84" href="#84">84</a>          Executor[] executorsCopy = <strong class="jxr_keyword">new</strong> Executor[executors.length];
<a class="jxr_linenumber" name="85" href="#85">85</a>          <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; executors.length; i ++) {
<a class="jxr_linenumber" name="86" href="#86">86</a>              <strong class="jxr_keyword">if</strong> (executors[i] == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="87" href="#87">87</a>                  <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"executors["</span> + i + ']');
<a class="jxr_linenumber" name="88" href="#88">88</a>              }
<a class="jxr_linenumber" name="89" href="#89">89</a>              executorsCopy[i] = executors[i];
<a class="jxr_linenumber" name="90" href="#90">90</a>          }
<a class="jxr_linenumber" name="91" href="#91">91</a>  
<a class="jxr_linenumber" name="92" href="#92">92</a>          <em class="jxr_comment">// Check dead lock.</em>
<a class="jxr_linenumber" name="93" href="#93">93</a>          <strong class="jxr_keyword">final</strong> Executor currentParent = deadLockChecker.get();
<a class="jxr_linenumber" name="94" href="#94">94</a>          <strong class="jxr_keyword">if</strong> (currentParent != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="95" href="#95">95</a>              <strong class="jxr_keyword">for</strong> (Executor e: executorsCopy) {
<a class="jxr_linenumber" name="96" href="#96">96</a>                  <strong class="jxr_keyword">if</strong> (e == currentParent) {
<a class="jxr_linenumber" name="97" href="#97">97</a>                      <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
<a class="jxr_linenumber" name="98" href="#98">98</a>                              <span class="jxr_string">"An Executor cannot be shut down from the thread "</span> +
<a class="jxr_linenumber" name="99" href="#99">99</a>                              <span class="jxr_string">"acquired from itself.  Please make sure you are "</span> +
<a class="jxr_linenumber" name="100" href="#100">100</a>                             <span class="jxr_string">"not calling releaseExternalResources() from an "</span> +
<a class="jxr_linenumber" name="101" href="#101">101</a>                             <span class="jxr_string">"I/O worker thread."</span>);
<a class="jxr_linenumber" name="102" href="#102">102</a>                 }
<a class="jxr_linenumber" name="103" href="#103">103</a>             }
<a class="jxr_linenumber" name="104" href="#104">104</a>         }
<a class="jxr_linenumber" name="105" href="#105">105</a> 
<a class="jxr_linenumber" name="106" href="#106">106</a>         <em class="jxr_comment">// Shut down all executors.</em>
<a class="jxr_linenumber" name="107" href="#107">107</a>         <strong class="jxr_keyword">boolean</strong> interrupted = false;
<a class="jxr_linenumber" name="108" href="#108">108</a>         <strong class="jxr_keyword">for</strong> (Executor e: executorsCopy) {
<a class="jxr_linenumber" name="109" href="#109">109</a>             <strong class="jxr_keyword">if</strong> (!(e instanceof ExecutorService)) {
<a class="jxr_linenumber" name="110" href="#110">110</a>                 <strong class="jxr_keyword">continue</strong>;
<a class="jxr_linenumber" name="111" href="#111">111</a>             }
<a class="jxr_linenumber" name="112" href="#112">112</a> 
<a class="jxr_linenumber" name="113" href="#113">113</a>             ExecutorService es = (ExecutorService) e;
<a class="jxr_linenumber" name="114" href="#114">114</a>             <strong class="jxr_keyword">for</strong> (;;) {
<a class="jxr_linenumber" name="115" href="#115">115</a>                 shutdownNow(es);
<a class="jxr_linenumber" name="116" href="#116">116</a> 
<a class="jxr_linenumber" name="117" href="#117">117</a>                 <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="118" href="#118">118</a>                     <strong class="jxr_keyword">if</strong> (es.awaitTermination(100, TimeUnit.MILLISECONDS)) {
<a class="jxr_linenumber" name="119" href="#119">119</a>                         <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="120" href="#120">120</a>                     }
<a class="jxr_linenumber" name="121" href="#121">121</a>                 } <strong class="jxr_keyword">catch</strong> (InterruptedException ex) {
<a class="jxr_linenumber" name="122" href="#122">122</a>                     interrupted = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="123" href="#123">123</a>                 }
<a class="jxr_linenumber" name="124" href="#124">124</a>             }
<a class="jxr_linenumber" name="125" href="#125">125</a>         }
<a class="jxr_linenumber" name="126" href="#126">126</a> 
<a class="jxr_linenumber" name="127" href="#127">127</a>         <strong class="jxr_keyword">if</strong> (interrupted) {
<a class="jxr_linenumber" name="128" href="#128">128</a>             Thread.currentThread().interrupt();
<a class="jxr_linenumber" name="129" href="#129">129</a>         }
<a class="jxr_linenumber" name="130" href="#130">130</a>     }
<a class="jxr_linenumber" name="131" href="#131">131</a> 
<a class="jxr_linenumber" name="132" href="#132">132</a>     <strong class="jxr_keyword">private</strong> <a href="../../../../../org/jboss/netty/util/internal/ExecutorUtil.html">ExecutorUtil</a>() {
<a class="jxr_linenumber" name="133" href="#133">133</a>     }
<a class="jxr_linenumber" name="134" href="#134">134</a> }
</pre>
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